The end of my block heater cord that connects to the block heater is worn out. The rubber is dry and cracked. Because of this, it does not stay plugged in correctly.
To save some money I want to try ...

I did search for this, and there are some oblique references to the sealant, but the full answer has come up that I can find.
The car is a 1998 Toyota Camry-XLE, 6 cylinder (1MZ-FE) engine with about ...